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MAX1954A
Low-Cost, Current-Mode PWM Buck Controller with Foldback Current Limit
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Status
Active: In Production.
Description
The MAX1954A synchronous current-mode, pulse-width modulation (PWM) buck controller is pin compatible with the popular MAX1954 and is suitable for applications where cost and size are critical.
The MAX1954A operates from an input voltage range of 3.0V to 13.2V, independent of the IC supply. The output voltage is adjustable down to 0.8V. The IC operates at a fixed 300kHz switching frequency and provides up to 25A of output current with efficiency up to 95%. This controller has excellent transient response resulting in smaller output capacitance.
The MAX1954A features foldback current limiting that greatly reduces input current and component power dissipation during output overload or short-circuit conditions.
The compensation and shutdown control (COMP) input, in addition to providing compensation to the error amplifier, can be pulled low to shut down the converter. An input undervoltage lockout is provided to ensure proper operation during power sags to prevent the external power MOSFETs from overheating. Internal digital soft-start is included to reduce inrush current and save an external capacitor.
The MAX1954A is available in a tiny 10-pin µMAX® package to minimize PC board space.
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Data Sheet
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An evaluation kit is available: MAX1954AEVKIT
Key Features
- Current-Mode Controller
- Fixed-Frequency PWM
- Foldback Current Limit
- Output Down to 0.8V with ±1% FB Accuracy
- 3.0V to 13.2V Input Voltage
- 300kHz Switching Frequency
- 25A Output-Current Capability
- 93% Efficiency
- All-N-Channel-MOSFET Design for Low Cost
- No Current-Sense Resistor Needed
- Internal Digital Soft-Start
- Small 10-Pin µMAX Package
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Applications/Uses
- Graphic Cards and Video Cards
- Low-Voltage Distributed Power
- Microprocessor Cores
- PCs and Servers
- Printers and Scanners
- Telecom/Networks
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Diagram
Typical Operating Circuit
Application Notes
Reliability Reports
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Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX1954AEUB
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Active |
µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10-2*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1954AEUB+
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Active |
µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10+2*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1954AEUB+T
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Active |
µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10+2*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1954AEUB-G05
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Active |
uMAX;
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX1954AEUB-G077
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Active |
uMAX;
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX1954AEUB-T
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Active |
µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10-2*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1954AEUB-TG05
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Active |
µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10-2*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1954AEUB-TG077
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Active |
µMAX;10 pin;15.4 mm²
Outline Drawing:21-0061 (PDF)
Land Pattern: 90-0330 (PDF)
Use pkgcode/variation: U10-2*
|
-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Information Index
Document Ref.: 19-3154
Rev 1;
2005-06-20
This page last modified: 2009-10-08
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